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The 2.0X APO Tele Converter EX DG from Sigma is mounted between the camera body and the lens to increase the focal length of your camera by 2.0X. Featuring focal length of 2.0X and aperture coupling range of F2.8 - F32, the APO Tele Converter EX decreases the effective aperture by two F-stops. This tele-converter employs lens coating technology to reduce both flare and ghosting. Compact and lightweight, this tele-converter is a convenient way of converting lenses into long focal-length lenses, therefore ensuring that those unexpected opportunities are not missed. The 2.0X APO Tele Converter EX DG is specifically designed for Select Nikon Mounts.